probes/lttng-events.h

   1 #include <lttng.h>
   2
   3 /*
   4  * Macros mapping tp_assign() to "=", tp_memcpy() to memcpy() and tp_strcpy() to
   5  * strcpy().
   6  */
   7 #undef tp_assign
   8 #define tp_assign(dest, src)                                            \
   9         lib_ring_buffer_align_ctx(config, &ctx, sizeof(src));           \
  10         lib_ring_buffer_write(config, &ctx, &src, sizeof(src));
  11
  12 #undef tp_memcpy
  13 #define tp_memcpy(dest, src, len)                                       \
  14         lib_ring_buffer_align_ctx(config, &ctx, sizeof(*(src)));        \
  15         lib_ring_buffer_write(config, &ctx, &src, len);
  16
  17 /* TODO */
  18 #undef tp_strcpy
  19 #define tp_strcpy(dest, src)            __assign_str(dest, src)
  20
  21 /*
  22  * Stage 1 of the trace events.
  23  *
  24  * Create event field type metadata section.
  25  */
  26
  27 /*
  28  * DECLARE_EVENT_CLASS can be used to add a generic function
  29  * handlers for events. That is, if all events have the same
  30  * parameters and just have distinct trace points.
  31  * Each tracepoint can be defined with DEFINE_EVENT and that
  32  * will map the DECLARE_EVENT_CLASS to the tracepoint.
  33  *
  34  * TRACE_EVENT is a one to one mapping between tracepoint and template.
  35  */
  36 #undef TRACE_EVENT
  37 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
  38         DECLARE_EVENT_CLASS(name,                              \
  39                              PARAMS(proto),                    \
  40                              PARAMS(args),                     \
  41                              PARAMS(tstruct),                  \
  42                              PARAMS(assign),                   \
  43                              PARAMS(print));                   \
  44         DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
  45
  46 /* Named field types must be defined in lttng-types.h */
  47
  48 /* TODO turn into a structure definition ? */
  49
  50 #undef __field
  51 #define __field(_type, _item)           #_type " " #_item ";\n"
  52
  53 #undef __field_ext
  54 #define __field_ext(_type, _item, _filter_type) #_type " " #_item ";\n"
  55
  56 #undef __array
  57 #define __array(_type, _item, _len)                             \
  58         "type { parent = array; length = " #_len "; elem_type = " #_type "; } " #_item";\n"
  59
  60 #undef __dynamic_array
  61 #define __dynamic_array(_type, _item, _len)                     \
  62         "type { parent = sequence; length_type = u32; elem_type = " #_type "; } " #_item ";\n"
  63
  64 #undef __string
  65 #define __string(_item, _src)                                   \
  66         "type { parent = string; encoding = UTF8; } " #_item ";\n"
  67
  68 #undef TP_PROTO
  69 #define TP_PROTO(args...)
  70
  71 #undef TP_ARGS
  72 #define TP_ARGS(args...)
  73
  74 #undef TP_STRUCT__entry
  75 #define TP_STRUCT__entry(args...) args  /* Only one used in this phase */
  76
  77 #undef TP_fast_assign
  78 #define TP_fast_assign(args...)
  79
  80 #undef TP_printk
  81 #define TP_printk(args...)
  82
  83 #undef DECLARE_EVENT_CLASS
  84 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)  \
  85         tstruct
  86
  87 #undef DEFINE_EVENT
  88 #define DEFINE_EVENT(template, name, proto, args)
  89
  90 #undef DEFINE_EVENT_PRINT
  91 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
  92         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  93
  94 /* Callbacks are meaningless to LTTng. */
  95 #undef TRACE_EVENT_FN
  96 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
  97                 assign, print, reg, unreg)                              \
  98         TRACE_EVENT(name, PARAMS(proto), PARAMS(args),                  \
  99                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
 100
 101 #undef DEFINE_TRACE_EVENT_METADATA
 102 #define DEFINE_TRACE_EVENT_METADATA                                     \
 103         const char trace_event_metadata_##TRACE_SYSTEM[]
 104
 105 //static DEFINE_TRACE_EVENT_METADATA =
 106 static const char blah[] =
 107 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 108 ;
 109
 110 #if 0
 111
 112 /*
 113  * Stage 2 of the trace events.
 114  *
 115  * Create static inline function that calculates event size.
 116  */
 117
 118
 119
 120 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 121
 122 /*
 123  * Stage 3 of the trace events.
 124  *
 125  * Create the probe function : call even size calculation and write event data
 126  * into the buffer.
 127  */
 128
 129
 130
 131 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 132
 133
 134
 135
 136 #include <linux/ftrace_event.h>
 137
 138 /*
 139  * DECLARE_EVENT_CLASS can be used to add a generic function
 140  * handlers for events. That is, if all events have the same
 141  * parameters and just have distinct trace points.
 142  * Each tracepoint can be defined with DEFINE_EVENT and that
 143  * will map the DECLARE_EVENT_CLASS to the tracepoint.
 144  *
 145  * TRACE_EVENT is a one to one mapping between tracepoint and template.
 146  */
 147 #undef TRACE_EVENT
 148 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
 149         DECLARE_EVENT_CLASS(name,                              \
 150                              PARAMS(proto),                    \
 151                              PARAMS(args),                     \
 152                              PARAMS(tstruct),                  \
 153                              PARAMS(assign),                   \
 154                              PARAMS(print));                   \
 155         DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
 156
 157
 158 #undef __field
 159 #define __field(type, item)             type    item;
 160
 161 #undef __field_ext
 162 #define __field_ext(type, item, filter_type)    type    item;
 163
 164 #undef __array
 165 #define __array(type, item, len)        type    item[len];
 166
 167 #undef __dynamic_array
 168 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
 169
 170 #undef __string
 171 #define __string(item, src) __dynamic_array(char, item, -1)
 172
 173 #undef TP_STRUCT__entry
 174 #define TP_STRUCT__entry(args...) args
 175
 176 #undef DECLARE_EVENT_CLASS
 177 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)  \
 178         struct ftrace_raw_##name {                                      \
 179                 struct trace_entry      ent;                            \
 180                 tstruct                                                 \
 181                 char                    __data[0];                      \
 182         };                                                              \
 183                                                                         \
 184         static struct ftrace_event_class event_class_##name;
 185
 186 #undef DEFINE_EVENT
 187 #define DEFINE_EVENT(template, name, proto, args)       \
 188         static struct ftrace_event_call __used          \
 189         __attribute__((__aligned__(4))) event_##name
 190
 191 #undef DEFINE_EVENT_PRINT
 192 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 193         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 194
 195 /* Callbacks are meaningless to ftrace. */
 196 #undef TRACE_EVENT_FN
 197 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
 198                 assign, print, reg, unreg)                              \
 199         TRACE_EVENT(name, PARAMS(proto), PARAMS(args),                  \
 200                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
 201
 202 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 203
 204
 205 /*
 206  * Stage 2 of the trace events.
 207  *
 208  * Create static inline function that calculates event size.
 209  */
 210
 211 #undef __field
 212 #define __field(type, item)
 213
 214 #undef __field_ext
 215 #define __field_ext(type, item, filter_type)
 216
 217 #undef __array
 218 #define __array(type, item, len)
 219
 220 #undef __dynamic_array
 221 #define __dynamic_array(type, item, len)        u32 item;
 222
 223 #undef __string
 224 #define __string(item, src) __dynamic_array(char, item, -1)
 225
 226 #undef DECLARE_EVENT_CLASS
 227 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 228         struct ftrace_data_offsets_##call {                             \
 229                 tstruct;                                                \
 230         };
 231
 232 #undef DEFINE_EVENT
 233 #define DEFINE_EVENT(template, name, proto, args)
 234
 235 #undef DEFINE_EVENT_PRINT
 236 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 237         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 238
 239 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 240
 241 /*
 242  * Stage 3 of the trace events.
 243  *
 244  * Create the probe function : call even size calculation and write event data
 245  * into the buffer.
 246  */
 247
 248 #undef __entry
 249 #define __entry field
 250
 251 #undef TP_printk
 252 #define TP_printk(fmt, args...) fmt "\n", args
 253
 254 #undef __get_dynamic_array
 255 #define __get_dynamic_array(field)      \
 256                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 257
 258 #undef __get_str
 259 #define __get_str(field) (char *)__get_dynamic_array(field)
 260
 261 #undef __print_flags
 262 #define __print_flags(flag, delim, flag_array...)                       \
 263         ({                                                              \
 264                 static const struct trace_print_flags __flags[] =       \
 265                         { flag_array, { -1, NULL }};                    \
 266                 ftrace_print_flags_seq(p, delim, flag, __flags);        \
 267         })
 268
 269 #undef __print_symbolic
 270 #define __print_symbolic(value, symbol_array...)                        \
 271         ({                                                              \
 272                 static const struct trace_print_flags symbols[] =       \
 273                         { symbol_array, { -1, NULL }};                  \
 274                 ftrace_print_symbols_seq(p, value, symbols);            \
 275         })
 276
 277 #undef __print_hex
 278 #define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
 279
 280 #undef DECLARE_EVENT_CLASS
 281 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 282 static notrace enum print_line_t                                        \
 283 ftrace_raw_output_##call(struct trace_iterator *iter, int flags,        \
 284                          struct trace_event *trace_event)               \
 285 {                                                                       \
 286         struct ftrace_event_call *event;                                \
 287         struct trace_seq *s = &iter->seq;                               \
 288         struct ftrace_raw_##call *field;                                \
 289         struct trace_entry *entry;                                      \
 290         struct trace_seq *p = &iter->tmp_seq;                           \
 291         int ret;                                                        \
 292                                                                         \
 293         event = container_of(trace_event, struct ftrace_event_call,     \
 294                              event);                                    \
 295                                                                         \
 296         entry = iter->ent;                                              \
 297                                                                         \
 298         if (entry->type != event->event.type) {                         \
 299                 WARN_ON_ONCE(1);                                        \
 300                 return TRACE_TYPE_UNHANDLED;                            \
 301         }                                                               \
 302                                                                         \
 303         field = (typeof(field))entry;                                   \
 304                                                                         \
 305         trace_seq_init(p);                                              \
 306         ret = trace_seq_printf(s, "%s: ", event->name);                 \
 307         if (ret)                                                        \
 308                 ret = trace_seq_printf(s, print);                       \
 309         if (!ret)                                                       \
 310                 return TRACE_TYPE_PARTIAL_LINE;                         \
 311                                                                         \
 312         return TRACE_TYPE_HANDLED;                                      \
 313 }                                                                       \
 314 static struct trace_event_functions ftrace_event_type_funcs_##call = {  \
 315         .trace                  = ftrace_raw_output_##call,             \
 316 };
 317
 318 #undef DEFINE_EVENT_PRINT
 319 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 320 static notrace enum print_line_t                                        \
 321 ftrace_raw_output_##call(struct trace_iterator *iter, int flags,        \
 322                          struct trace_event *event)                     \
 323 {                                                                       \
 324         struct trace_seq *s = &iter->seq;                               \
 325         struct ftrace_raw_##template *field;                            \
 326         struct trace_entry *entry;                                      \
 327         struct trace_seq *p = &iter->tmp_seq;                           \
 328         int ret;                                                        \
 329                                                                         \
 330         entry = iter->ent;                                              \
 331                                                                         \
 332         if (entry->type != event_##call.event.type) {                   \
 333                 WARN_ON_ONCE(1);                                        \
 334                 return TRACE_TYPE_UNHANDLED;                            \
 335         }                                                               \
 336                                                                         \
 337         field = (typeof(field))entry;                                   \
 338                                                                         \
 339         trace_seq_init(p);                                              \
 340         ret = trace_seq_printf(s, "%s: ", #call);                       \
 341         if (ret)                                                        \
 342                 ret = trace_seq_printf(s, print);                       \
 343         if (!ret)                                                       \
 344                 return TRACE_TYPE_PARTIAL_LINE;                         \
 345                                                                         \
 346         return TRACE_TYPE_HANDLED;                                      \
 347 }                                                                       \
 348 static struct trace_event_functions ftrace_event_type_funcs_##call = {  \
 349         .trace                  = ftrace_raw_output_##call,             \
 350 };
 351
 352 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 353
 354 #undef __field_ext
 355 #define __field_ext(type, item, filter_type)                            \
 356         ret = trace_define_field(event_call, #type, #item,              \
 357                                  offsetof(typeof(field), item),         \
 358                                  sizeof(field.item),                    \
 359                                  is_signed_type(type), filter_type);    \
 360         if (ret)                                                        \
 361                 return ret;
 362
 363 #undef __field
 364 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 365
 366 #undef __array
 367 #define __array(type, item, len)                                        \
 368         BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                         \
 369         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
 370                                  offsetof(typeof(field), item),         \
 371                                  sizeof(field.item),                    \
 372                                  is_signed_type(type), FILTER_OTHER);   \
 373         if (ret)                                                        \
 374                 return ret;
 375
 376 #undef __dynamic_array
 377 #define __dynamic_array(type, item, len)                                       \
 378         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
 379                                  offsetof(typeof(field), __data_loc_##item),   \
 380                                  sizeof(field.__data_loc_##item),              \
 381                                  is_signed_type(type), FILTER_OTHER);
 382
 383 #undef __string
 384 #define __string(item, src) __dynamic_array(char, item, -1)
 385
 386 #undef DECLARE_EVENT_CLASS
 387 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
 388 static int notrace                                                      \
 389 ftrace_define_fields_##call(struct ftrace_event_call *event_call)       \
 390 {                                                                       \
 391         struct ftrace_raw_##call field;                                 \
 392         int ret;                                                        \
 393                                                                         \
 394         tstruct;                                                        \
 395                                                                         \
 396         return ret;                                                     \
 397 }
 398
 399 #undef DEFINE_EVENT
 400 #define DEFINE_EVENT(template, name, proto, args)
 401
 402 #undef DEFINE_EVENT_PRINT
 403 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 404         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 405
 406 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 407
 408 /*
 409  * remember the offset of each array from the beginning of the event.
 410  */
 411
 412 #undef __entry
 413 #define __entry entry
 414
 415 #undef __field
 416 #define __field(type, item)
 417
 418 #undef __field_ext
 419 #define __field_ext(type, item, filter_type)
 420
 421 #undef __array
 422 #define __array(type, item, len)
 423
 424 #undef __dynamic_array
 425 #define __dynamic_array(type, item, len)                                \
 426         __data_offsets->item = __data_size +                            \
 427                                offsetof(typeof(*entry), __data);        \
 428         __data_offsets->item |= (len * sizeof(type)) << 16;             \
 429         __data_size += (len) * sizeof(type);
 430
 431 #undef __string
 432 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
 433
 434 #undef DECLARE_EVENT_CLASS
 435 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 436 static inline notrace int ftrace_get_offsets_##call(                    \
 437         struct ftrace_data_offsets_##call *__data_offsets, proto)       \
 438 {                                                                       \
 439         int __data_size = 0;                                            \
 440         struct ftrace_raw_##call __maybe_unused *entry;                 \
 441                                                                         \
 442         tstruct;                                                        \
 443                                                                         \
 444         return __data_size;                                             \
 445 }
 446
 447 #undef DEFINE_EVENT
 448 #define DEFINE_EVENT(template, name, proto, args)
 449
 450 #undef DEFINE_EVENT_PRINT
 451 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 452         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 453
 454 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 455
 456 /*
 457  * Stage 4 of the trace events.
 458  *
 459  * Override the macros in <trace/trace_events.h> to include the following:
 460  *
 461  * For those macros defined with TRACE_EVENT:
 462  *
 463  * static struct ftrace_event_call event_<call>;
 464  *
 465  * static void ftrace_raw_event_<call>(void *__data, proto)
 466  * {
 467  *      struct ftrace_event_call *event_call = __data;
 468  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 469  *      struct ring_buffer_event *event;
 470  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
 471  *      struct ring_buffer *buffer;
 472  *      unsigned long irq_flags;
 473  *      int __data_size;
 474  *      int pc;
 475  *
 476  *      local_save_flags(irq_flags);
 477  *      pc = preempt_count();
 478  *
 479  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 480  *
 481  *      event = trace_current_buffer_lock_reserve(&buffer,
 482  *                                event_<call>->event.type,
 483  *                                sizeof(*entry) + __data_size,
 484  *                                irq_flags, pc);
 485  *      if (!event)
 486  *              return;
 487  *      entry   = ring_buffer_event_data(event);
 488  *
 489  *      { <assign>; }  <-- Here we assign the entries by the __field and
 490  *                         __array macros.
 491  *
 492  *      if (!filter_current_check_discard(buffer, event_call, entry, event))
 493  *              trace_current_buffer_unlock_commit(buffer,
 494  *                                                 event, irq_flags, pc);
 495  * }
 496  *
 497  * static struct trace_event ftrace_event_type_<call> = {
 498  *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
 499  * };
 500  *
 501  * static const char print_fmt_<call>[] = <TP_printk>;
 502  *
 503  * static struct ftrace_event_class __used event_class_<template> = {
 504  *      .system                 = "<system>",
 505  *      .define_fields          = ftrace_define_fields_<call>,
 506  *      .fields                 = LIST_HEAD_INIT(event_class_##call.fields),
 507  *      .raw_init               = trace_event_raw_init,
 508  *      .probe                  = ftrace_raw_event_##call,
 509  *      .reg                    = ftrace_event_reg,
 510  * };
 511  *
 512  * static struct ftrace_event_call __used
 513  * __attribute__((__aligned__(4)))
 514  * __attribute__((section("_ftrace_events"))) event_<call> = {
 515  *      .name                   = "<call>",
 516  *      .class                  = event_class_<template>,
 517  *      .event                  = &ftrace_event_type_<call>,
 518  *      .print_fmt              = print_fmt_<call>,
 519  * };
 520  *
 521  */
 522
 523 #ifdef CONFIG_PERF_EVENTS
 524
 525 #define _TRACE_PERF_PROTO(call, proto)                                  \
 526         static notrace void                                             \
 527         perf_trace_##call(void *__data, proto);
 528
 529 #define _TRACE_PERF_INIT(call)                                          \
 530         .perf_probe             = perf_trace_##call,
 531
 532 #else
 533 #define _TRACE_PERF_PROTO(call, proto)
 534 #define _TRACE_PERF_INIT(call)
 535 #endif /* CONFIG_PERF_EVENTS */
 536
 537 #undef __entry
 538 #define __entry entry
 539
 540 #undef __field
 541 #define __field(type, item)
 542
 543 #undef __array
 544 #define __array(type, item, len)
 545
 546 #undef __dynamic_array
 547 #define __dynamic_array(type, item, len)                                \
 548         __entry->__data_loc_##item = __data_offsets.item;
 549
 550 #undef __string
 551 #define __string(item, src) __dynamic_array(char, item, -1)             \
 552
 553 #undef __assign_str
 554 #define __assign_str(dst, src)                                          \
 555         strcpy(__get_str(dst), src);
 556
 557 #undef TP_fast_assign
 558 #define TP_fast_assign(args...) args
 559
 560 #undef TP_perf_assign
 561 #define TP_perf_assign(args...)
 562
 563 #undef DECLARE_EVENT_CLASS
 564 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 565                                                                         \
 566 static notrace void                                                     \
 567 ftrace_raw_event_##call(void *__data, proto)                            \
 568 {                                                                       \
 569         struct ftrace_event_call *event_call = __data;                  \
 570         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 571         struct ring_buffer_event *event;                                \
 572         struct ftrace_raw_##call *entry;                                \
 573         struct ring_buffer *buffer;                                     \
 574         unsigned long irq_flags;                                        \
 575         int __data_size;                                                \
 576         int pc;                                                         \
 577                                                                         \
 578         local_save_flags(irq_flags);                                    \
 579         pc = preempt_count();                                           \
 580                                                                         \
 581         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 582                                                                         \
 583         event = trace_current_buffer_lock_reserve(&buffer,              \
 584                                  event_call->event.type,                \
 585                                  sizeof(*entry) + __data_size,          \
 586                                  irq_flags, pc);                        \
 587         if (!event)                                                     \
 588                 return;                                                 \
 589         entry   = ring_buffer_event_data(event);                        \
 590                                                                         \
 591         tstruct                                                         \
 592                                                                         \
 593         { assign; }                                                     \
 594                                                                         \
 595         if (!filter_current_check_discard(buffer, event_call, entry, event)) \
 596                 trace_nowake_buffer_unlock_commit(buffer,               \
 597                                                   event, irq_flags, pc); \
 598 }
 599 /*
 600  * The ftrace_test_probe is compiled out, it is only here as a build time check
 601  * to make sure that if the tracepoint handling changes, the ftrace probe will
 602  * fail to compile unless it too is updated.
 603  */
 604
 605 #undef DEFINE_EVENT
 606 #define DEFINE_EVENT(template, call, proto, args)                       \
 607 static inline void ftrace_test_probe_##call(void)                       \
 608 {                                                                       \
 609         check_trace_callback_type_##call(ftrace_raw_event_##template);  \
 610 }
 611
 612 #undef DEFINE_EVENT_PRINT
 613 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 614
 615 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 616
 617 #undef __entry
 618 #define __entry REC
 619
 620 #undef __print_flags
 621 #undef __print_symbolic
 622 #undef __get_dynamic_array
 623 #undef __get_str
 624
 625 #undef TP_printk
 626 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 627
 628 #undef DECLARE_EVENT_CLASS
 629 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 630 _TRACE_PERF_PROTO(call, PARAMS(proto));                                 \
 631 static const char print_fmt_##call[] = print;                           \
 632 static struct ftrace_event_class __used event_class_##call = {          \
 633         .system                 = __stringify(TRACE_SYSTEM),            \
 634         .define_fields          = ftrace_define_fields_##call,          \
 635         .fields                 = LIST_HEAD_INIT(event_class_##call.fields),\
 636         .raw_init               = trace_event_raw_init,                 \
 637         .probe                  = ftrace_raw_event_##call,              \
 638         .reg                    = ftrace_event_reg,                     \
 639         _TRACE_PERF_INIT(call)                                          \
 640 };
 641
 642 #undef DEFINE_EVENT
 643 #define DEFINE_EVENT(template, call, proto, args)                       \
 644                                                                         \
 645 static struct ftrace_event_call __used                                  \
 646 __attribute__((__aligned__(4)))                                         \
 647 __attribute__((section("_ftrace_events"))) event_##call = {             \
 648         .name                   = #call,                                \
 649         .class                  = &event_class_##template,              \
 650         .event.funcs            = &ftrace_event_type_funcs_##template,  \
 651         .print_fmt              = print_fmt_##template,                 \
 652 };
 653
 654 #undef DEFINE_EVENT_PRINT
 655 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 656                                                                         \
 657 static const char print_fmt_##call[] = print;                           \
 658                                                                         \
 659 static struct ftrace_event_call __used                                  \
 660 __attribute__((__aligned__(4)))                                         \
 661 __attribute__((section("_ftrace_events"))) event_##call = {             \
 662         .name                   = #call,                                \
 663         .class                  = &event_class_##template,              \
 664         .event.funcs            = &ftrace_event_type_funcs_##call,      \
 665         .print_fmt              = print_fmt_##call,                     \
 666 }
 667
 668 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 669
 670 /*
 671  * Define the insertion callback to perf events
 672  *
 673  * The job is very similar to ftrace_raw_event_<call> except that we don't
 674  * insert in the ring buffer but in a perf counter.
 675  *
 676  * static void ftrace_perf_<call>(proto)
 677  * {
 678  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 679  *      struct ftrace_event_call *event_call = &event_<call>;
 680  *      extern void perf_tp_event(int, u64, u64, void *, int);
 681  *      struct ftrace_raw_##call *entry;
 682  *      struct perf_trace_buf *trace_buf;
 683  *      u64 __addr = 0, __count = 1;
 684  *      unsigned long irq_flags;
 685  *      struct trace_entry *ent;
 686  *      int __entry_size;
 687  *      int __data_size;
 688  *      int __cpu
 689  *      int pc;
 690  *
 691  *      pc = preempt_count();
 692  *
 693  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 694  *
 695  *      // Below we want to get the aligned size by taking into account
 696  *      // the u32 field that will later store the buffer size
 697  *      __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
 698  *                           sizeof(u64));
 699  *      __entry_size -= sizeof(u32);
 700  *
 701  *      // Protect the non nmi buffer
 702  *      // This also protects the rcu read side
 703  *      local_irq_save(irq_flags);
 704  *      __cpu = smp_processor_id();
 705  *
 706  *      if (in_nmi())
 707  *              trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
 708  *      else
 709  *              trace_buf = rcu_dereference_sched(perf_trace_buf);
 710  *
 711  *      if (!trace_buf)
 712  *              goto end;
 713  *
 714  *      trace_buf = per_cpu_ptr(trace_buf, __cpu);
 715  *
 716  *      // Avoid recursion from perf that could mess up the buffer
 717  *      if (trace_buf->recursion++)
 718  *              goto end_recursion;
 719  *
 720  *      raw_data = trace_buf->buf;
 721  *
 722  *      // Make recursion update visible before entering perf_tp_event
 723  *      // so that we protect from perf recursions.
 724  *
 725  *      barrier();
 726  *
 727  *      //zero dead bytes from alignment to avoid stack leak to userspace:
 728  *      *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
 729  *      entry = (struct ftrace_raw_<call> *)raw_data;
 730  *      ent = &entry->ent;
 731  *      tracing_generic_entry_update(ent, irq_flags, pc);
 732  *      ent->type = event_call->id;
 733  *
 734  *      <tstruct> <- do some jobs with dynamic arrays
 735  *
 736  *      <assign>  <- affect our values
 737  *
 738  *      perf_tp_event(event_call->id, __addr, __count, entry,
 739  *                   __entry_size);  <- submit them to perf counter
 740  *
 741  * }
 742  */
 743
 744 #ifdef CONFIG_PERF_EVENTS
 745
 746 #undef __entry
 747 #define __entry entry
 748
 749 #undef __get_dynamic_array
 750 #define __get_dynamic_array(field)      \
 751                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 752
 753 #undef __get_str
 754 #define __get_str(field) (char *)__get_dynamic_array(field)
 755
 756 #undef __perf_addr
 757 #define __perf_addr(a) __addr = (a)
 758
 759 #undef __perf_count
 760 #define __perf_count(c) __count = (c)
 761
 762 #undef DECLARE_EVENT_CLASS
 763 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 764 static notrace void                                                     \
 765 perf_trace_##call(void *__data, proto)                                  \
 766 {                                                                       \
 767         struct ftrace_event_call *event_call = __data;                  \
 768         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 769         struct ftrace_raw_##call *entry;                                \
 770         struct pt_regs __regs;                                          \
 771         u64 __addr = 0, __count = 1;                                    \
 772         struct hlist_head *head;                                        \
 773         int __entry_size;                                               \
 774         int __data_size;                                                \
 775         int rctx;                                                       \
 776                                                                         \
 777         perf_fetch_caller_regs(&__regs);                                \
 778                                                                         \
 779         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 780         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
 781                              sizeof(u64));                              \
 782         __entry_size -= sizeof(u32);                                    \
 783                                                                         \
 784         if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE,               \
 785                       "profile buffer not large enough"))               \
 786                 return;                                                 \
 787                                                                         \
 788         entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare(     \
 789                 __entry_size, event_call->event.type, &__regs, &rctx);  \
 790         if (!entry)                                                     \
 791                 return;                                                 \
 792                                                                         \
 793         tstruct                                                         \
 794                                                                         \
 795         { assign; }                                                     \
 796                                                                         \
 797         head = this_cpu_ptr(event_call->perf_events);                   \
 798         perf_trace_buf_submit(entry, __entry_size, rctx, __addr,        \
 799                 __count, &__regs, head);                                \
 800 }
 801
 802 /*
 803  * This part is compiled out, it is only here as a build time check
 804  * to make sure that if the tracepoint handling changes, the
 805  * perf probe will fail to compile unless it too is updated.
 806  */
 807 #undef DEFINE_EVENT
 808 #define DEFINE_EVENT(template, call, proto, args)                       \
 809 static inline void perf_test_probe_##call(void)                         \
 810 {                                                                       \
 811         check_trace_callback_type_##call(perf_trace_##template);        \
 812 }
 813
 814
 815 #undef DEFINE_EVENT_PRINT
 816 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 817         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 818
 819 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 820 #endif /* CONFIG_PERF_EVENTS */
 821
 822 #undef _TRACE_PROFILE_INIT
 823 #endif //0